Weekend game deals: 25% off Civilization V

As a reminder, Steam's 'Treasure Hunt' event will conclude Monday, December 20, so there's only a few days left to complete objectives. As part of the latest set of objectives, the distribution service has cut 25% off Civilization V, 75% off Zombie Driver, and 75% off Bob Came in Pieces. In addition to its usual discounts, Direct2Drive offers 20% off IGN's best of 2010 nominees. GOG has reduced its entire catalog by up to 50%, while Impulse and GamersGate have slashed an assortment of titles including the Battlefield 2 Complete Collection and Sniper: Ghost Warrior.